155701961 has 2 divisors, whose sum is σ = 155701962. Its totient is φ = 155701960.

The previous prime is 155701943. The next prime is 155701999. The reversal of 155701961 is 169107551.

It is a happy number.

155701961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 136165561 + 19536400 = 11669^2 + 4420^2 .

It is a cyclic number.

It is not a de Polignac number, because 155701961 - 2¹⁴ = 155685577 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (155701901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77850980 + 77850981.

It is an arithmetic number, because the mean of its divisors is an integer number (77850981).

Almost surely, 2^155701961 is an apocalyptic number.

It is an amenable number.

155701961 is a deficient number, since it is larger than the sum of its proper divisors (1).

155701961 is an equidigital number, since it uses as much as digits as its factorization.

155701961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9450, while the sum is 35.

The square root of 155701961 is about 12478.0591840238. The cubic root of 155701961 is about 537.9782205820.

The spelling of 155701961 in words is "one hundred fifty-five million, seven hundred one thousand, nine hundred sixty-one".